An electrical current is influenced by which of the following? 1. Voltage 2. Resistance 3. ...

(Answer to Q. 1)  ANS: A
Electrical currents are influenced by voltage (the electromotive force pushing electrons forward) and the resistance electrons must overcome along the conductive pathway. An insulator is the material surrounding the conductive material and is usually made of plastic.

(Answer to Q. 2)  ANS: A
According to Kirchhoff's laws regarding series circuits, total resistance is equal to the sum of all resistors in the circuit. If the circuit has three resistors, total resistance = A + B + C. Therefore, 100 = A + B + C. If one resistor is 40 , then 100 = 40 + B + C and the sum of B + C must equal 60 .

(Answer to Q. 3)  ANS: C
In a series circuit, there is only one path. If a break occurs anywhere in the path, the entire circuit will fail.

(Answer to Q. 4)  ANS: C
The standard unit of measurement of electrical current is the ampere (A), where 1A is equivalent to 6.25  1018 electrons passing a point in 1 second. The term coulomb is used as a shorthand no-tation for 6.25  1018 electrons. The standard unit of measurement for voltage is the volt (V). A milliampere is equal to 0.001 A.

(Answer to Q. 5)  ANS: B
The relationships among current, voltage, and resistance can be explained with Ohm's law: V = I  R.

(Answer to Q. 6)  ANS: D
Given the fact that when resistance is constant, there is a direct relationship between voltage and current; when voltage is constant, there is an indirect or inverse relationship between current and resistance. Therefore, if current is increased, resistance would have to decrease proportionately.

(Answer to Q. 7)  ANS: C
Electricity is produced by the flow of electrons through a conductive material such as copper. Electricity cannot flow through nonconductive material or simultaneously run bidirectionally along the same path.